[Elecraft] K3EXREF - What am I doing wrong

[Tighe Kuykendall]

I picked up the Leo Bodnar frequency reference and a K3EXREF board after 
reading a couple of threads here.  I Installed the board according to 
instructions, took static precautions, am using a known good cable from 
the K3 to said reference.  I can clearly hear the 10MHz tone on my K3 
when I tune a VFO to 10MHz and the signal goes away if I disconnect the 
coax from the freq reference.  I've checked all of the tmp connectors 
and reseated the K3EXREF board on the K3REF board and all pins are 
properly engaged.  But still no * on the display and the REF CAL setting 
remains unlocked.

Am I missing something, is there something to do to enable the K3EXREF 
other than plug in the freq reference and wait for some magic to happen?

73, Tighe NK4I